PCM EX-343 Hesitation

[Lwalker]

2008 PCM EX-343
189 hours

Symptoms:
Rough/Low Idle(seems low, gauge says about 525, book says it is supposed to be 650)
Skipping/Hesitation at cruise
Bogs down at take off...have to ease into the throttle

Purchased boat in June 2017 with 170 hours on it
Actions so far in order:
Drained fuel after purchase and filled with 89 octane non-ethanol.
Replaced FCC Filter
Replaced inline fuel filter
Put 20 hours on it last summer
Replaced Distributor cap
Change oil and oil filter
Went to the lake yesterday

The symptoms have not changed. The boat is usable with the symptoms but I am ready to get it running smooth.

Info:
Idle - 525 RPMs - 158 Degrees - 38 PSI
Idle, In gear - 500 RPMs - 158 Degrees - 45 PSI
2900 RPMs - 25MPH - 143 Degrees - 62PSI
4400 RPMs - 37MPH - 143 Degrees - 71PSI

Voltage is 14.3 on the gauge


What should my next step be? Thanks in advance for any help.

[Lwalker]

Based on some more research, I think I am going to change the plugs first....seems that some others have experienced this with bad/worn plugs.

[ScooterMcgavin]

your on the right track with the plugs,if that doesn't fix it, move on to the rotor and plug wires.

[surroundsound64]

I had the same issue with my 343. Bad plugs.

[Infinity]

x3

[SuperAirIan]

Same problem last year. New rotor, cap, plugs and wires. Don't honestly know what cured it explicitly, but something in that combo sure did the trick. I hadn't done any of that in 7 years so it was high time.

[Bevostein]

Plugs

[Lwalker]

Thanks Guys. It was the plugs. Whole new boat.

[ScooterMcgavin]

Awesome! Glad it worked out and thank you for reporting back that it fixed your issue.